"Children as well as parents need to find excuses to move whenever possible and be especially active during leisure time," he added.

Restricting media exposure could also help the obese kids stay sharp, the study said.

Sensory overload and "noise" from popular culture, gaming, advertising, media and electronics crowds out important things such as family matters, academics, sleep, and the development of other interests.

"Celebrations, such as birthday parties, are less meaningful. Do not stress over the occasional special treat, but be strict about everyday routines," Kaliebe said.

"Habits have profound effects," he concluded.

The study appeared in the Journal of the American Academy of Child and Adolescent Psychiatry.